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  <title>获取引用的唯一 ID</title>
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  <div id="layout-content"><div id="reflectionreference.getid" class="refentry">
 <div class="refnamediv">
  <h1 class="refname">ReflectionReference::getId</h1>
  <p class="verinfo">(PHP 7 &gt;= 7.4.0, PHP 8)</p><p class="refpurpose"><span class="refname">ReflectionReference::getId</span> &mdash; <span class="dc-title">获取引用的唯一 ID</span></p>

 </div>

 <div class="refsect1 description" id="refsect1-reflectionreference.getid-description">
  <h3 class="title">说明</h3>
  <div class="methodsynopsis dc-description">
   <span class="modifier">public</span> <span class="methodname"><strong>ReflectionReference::getId</strong></span>(): <span class="type">string</span></div>

  <p class="para rdfs-comment">
   返回一个 ID，该 ID 在该引用的生命周期内对于该引用是唯一的。
   此 ID 可用于比较引用的相等性，或维护已知引用的映射。
  </p>
 </div>


 <div class="refsect1 parameters" id="refsect1-reflectionreference.getid-parameters">
  <h3 class="title">参数</h3>
  <p class="para">此函数没有参数。</p>
 </div>


 <div class="refsect1 returnvalues" id="refsect1-reflectionreference.getid-returnvalues">
  <h3 class="title">返回值</h3>
  <p class="para">
   返回一个未指定格式的 <span class="type">string</span>。
  </p>
 </div>


 <div class="refsect1 examples" id="refsect1-reflectionreference.getid-examples">
  <h3 class="title">范例</h3>
  <div class="example" id="reflectionreference.getid.example.basic">
   <p><strong>示例 #1 基本的 <span class="methodname"><strong>ReflectionReference::getId()</strong></span> 用法</strong></p>
   <div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br />$val1&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #DD0000">'foo'</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$val2&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #DD0000">'bar'</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$arr&nbsp;</span><span style="color: #007700">=&nbsp;[&amp;</span><span style="color: #0000BB">$val1</span><span style="color: #007700">,&nbsp;&amp;</span><span style="color: #0000BB">$val2</span><span style="color: #007700">,&nbsp;&amp;</span><span style="color: #0000BB">$val1</span><span style="color: #007700">];<br /><br /></span><span style="color: #0000BB">$rr1&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">ReflectionReference</span><span style="color: #007700">::</span><span style="color: #0000BB">fromArrayElement</span><span style="color: #007700">(</span><span style="color: #0000BB">$arr</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">0</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$rr2&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">ReflectionReference</span><span style="color: #007700">::</span><span style="color: #0000BB">fromArrayElement</span><span style="color: #007700">(</span><span style="color: #0000BB">$arr</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">1</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$rr3&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">ReflectionReference</span><span style="color: #007700">::</span><span style="color: #0000BB">fromArrayElement</span><span style="color: #007700">(</span><span style="color: #0000BB">$arr</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">2</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">$rr1</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">getId</span><span style="color: #007700">()&nbsp;===&nbsp;</span><span style="color: #0000BB">$rr2</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">getId</span><span style="color: #007700">());<br /></span><span style="color: #0000BB">var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">$rr1</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">getId</span><span style="color: #007700">()&nbsp;===&nbsp;</span><span style="color: #0000BB">$rr3</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">getId</span><span style="color: #007700">());<br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</code></div>
   </div>

   <div class="example-contents"><p>以上例程会输出：</p></div>
   <div class="example-contents screen">
<div class="cdata"><pre>
bool(false)
bool(true)
</pre></div>
   </div>
  </div>
 </div>


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